Common Misconceptions About Different Blood Tests Results

Paperwork for Blood tests

Blood tests are valuable tools used by healthcare professionals to assess various aspects of a person’s health. However, the blood test results interpretation can sometimes be misleading or misunderstood. 

Different Blood tests

Also, inaccurate blood test results can be troublesome for doctors to conclude your health condition precisely. Besides, misinterpreting the results may also negatively influence diagnosis, treatments, and personal mental state. 

In this article, we will address common misconceptions about different blood test results, shedding light on the need for proper understanding and interpretation by qualified medical professionals.

10 Common Misconceptions About Different Blood Test Results

Blood samples

Knowing about the different misconceptions and their accurate explanations is essential for you if you’re supposed to go through several blood tests quickly. 

Even if it’s not too many tests, being able to differentiate between the misconceptions and correct diagnosis is vital for your approach to certain physical conditions. 

Below are ten common misconceptions about different blood test results, along with the right explanation for each: 

1. Cholesterol Levels

Misconception: High cholesterol means immediate danger.

Explanation: High cholesterol levels are a risk factor for cardiovascular disease but do not necessarily indicate immediate danger. Cholesterol levels should be evaluated with factors such as blood pressure, smoking habits, family history, and overall cardiovascular health. 

Considering the complete clinical picture is essential rather than focusing solely on cholesterol levels.

2. Being CA125 Positive 

Misconception: Being CA125 positive means having ovarian cancer.

Explanation: While elevated CA125 levels can be associated with ovarian cancer, it is important to note that CA125 is not a definitive diagnostic test for ovarian cancer. There are several reasons why a person may have developed CA125 and upped its levels that aren’t related to ovarian cancer, such as non-cancerous conditions, benign ovarian conditions, false positives, false negatives, etc. 

To get the right answer, CA125 blood tests at private test facilities should be acquired from reliable hospitals and clinics. 

3. White Blood Cell Count

Misconception: Low white blood cell count always indicates a weak immune system.

Explanation: A low white blood cell count (leukopenia) can be associated with a weakened immune system, but it is not the sole determinant. Several factors can influence white blood cell counts, such as certain medications, viral infections, autoimmune disorders, and bone marrow diseases. 

A comprehensive evaluation is necessary to identify the underlying cause and determine the impact on the immune system.

4. Thyroid Function Tests

Misconception: A slightly abnormal thyroid test result always indicates a thyroid disorder.

Explanation: Thyroid function tests, including TSH (thyroid-stimulating hormone), T3 (triiodothyronine), and T4 (thyroxine) levels, help assess thyroid function. It’s important to remember that minor fluctuations in thyroid hormone levels can occur due to various factors like stress, illness, medication changes, or temporary hormonal imbalances. 

Isolated abnormal results may not indicate a thyroid disorder and may require follow-up testing for confirmation.

5. Liver Function Tests

Misconception: Elevated liver enzymes always signify liver damage or disease.

Explanation: Liver function tests (LFTs) measure levels of enzymes and other substances associated with liver health. While elevated liver enzymes can indicate liver damage or disease, it is crucial to consider other factors. 

Certain medications, alcohol consumption, muscle injury, and intense physical exercise can temporarily raise liver enzyme levels. Additional testing and clinical evaluation are necessary to determine the underlying cause of elevated liver enzymes.

6. Hemoglobin A1c

Misconception: Hemoglobin A1c levels can diagnose diabetes on their own.

Explanation: Hemoglobin A1c (HbA1c) is a blood test that provides an average measure of blood sugar control over the past two to three months. While it’s useful for monitoring long-term glucose levels, it’s insufficient to diagnose diabetes independently. 

Diabetes diagnosis requires additional tests such as fasting plasma glucose, oral glucose tolerance test, or random plasma glucose. HbA1c should be interpreted in conjunction with other clinical and diagnostic criteria.

7. Vitamin D Levels

Misconception: Low vitamin D levels always indicate a deficiency.

Explanation: Vitamin D plays a crucial role in bone health, immune function, and other physiological processes. While low vitamin D levels are common, especially in certain populations or during specific seasons, they may not always indicate a deficiency. 

The interpretation of vitamin D levels should consider age, geographical location, sun exposure, dietary intake, and individual health conditions. It’s important to consult a healthcare professional to assess the need for supplementation or lifestyle modifications.

8. Complete Blood Count (CBC)

Misconception: Anemia is the only significant finding in a complete blood count.

Explanation: A complete blood count evaluates various blood components, including red blood cells, white blood cells, and platelets. While anemia (low red blood cell count or low hemoglobin levels) is a common finding in a CBC, it is not the only significant result. 

CBC can provide valuable information about white blood cell counts (indicating infection or inflammation), platelet counts (related to clotting disorders), and other parameters that aid in diagnosing and managing various conditions. Each component of the CBC should be carefully analyzed to gain a comprehensive understanding of a person’s blood health.

9. Kidney Function Tests

Misconception: Elevated creatinine levels always indicate kidney disease.

Explanation: Kidney function tests, such as serum creatinine and blood urea nitrogen (BUN), help assess the health of the kidneys. While elevated creatinine levels can indicate kidney dysfunction, they are not definitive proof of kidney disease. 

Factors such as muscle mass, certain medications, and dehydration can affect creatinine levels. Other tests like urine analysis and glomerular filtration rate (GFR) calculations are necessary to accurately evaluate kidney function.

10. PSA (Prostate-Specific Antigen) Test

Misconception: High PSA levels always indicate prostate cancer.

Explanation: PSA is a protein produced by the prostate gland, and PSA testing is commonly used for prostate cancer screening. However, elevated PSA levels can be caused by various factors, including benign prostatic hyperplasia (BPH), prostatitis (prostate inflammation), urinary tract infections, and certain medications. 

Further diagnostic tests, such as prostate biopsies, are required to determine prostate cancer’s presence accurately.


11. C-Reactive Protein (CRP)

Misconception: Elevated CRP levels always signify an infection.

Explanation: C-reactive protein (CRP) is a marker of inflammation in the body. While increased CRP levels can indicate an infection, they are also associated with other conditions, such as autoimmune disorders, tissue injury, and cardiovascular disease. 

The interpretation of CRP results should consider other clinical signs and symptoms to determine the underlying cause of inflammation accurately.

Possible Reasons for Inaccurate Blood Test Results

Blood sample collection

Inaccurate blood test results can occur due to various factors. It’s important to note that laboratory errors are relatively rare, thanks to strict quality control measures in place. 

However, certain conditions and circumstances can influence blood test results. Here are some factors that can cause inaccurate blood test results:

  • Improper Sample Handling: Mishandling or improper storage of blood samples can lead to inaccurate results. For example, if a sample is not stored at the correct temperature or if there is a delay in transporting the sample to the laboratory, it may affect the stability of certain substances in the blood, leading to erroneous results.
  • Medications and Supplements: Certain medications and supplements can interfere with blood test results. They may either suppress or elevate certain markers or substances in the blood, leading to misleading readings. It’s important to inform your healthcare provider about all your medications, supplements, and herbal remedies before undergoing blood tests.
  • Fasting and Diet: Some blood tests require fasting before the test. Eating before a fasting blood test may affect the levels of glucose, lipids, and other substances in the blood, leading to inaccurate readings. Similarly, certain dietary factors, such as high-fat meals or excessive alcohol consumption, can affect liver function test results.
  • Timing of the Test: Timing is crucial for certain blood tests. For instance, hormone levels may fluctuate throughout the day, and specific tests require blood samples to be collected at specific times. Not adhering to the recommended timing may result in misleading results.
  • Stress and Physical Activity: Stress and intense physical activity can impact various blood test results. They can influence hormone levels, white blood cell counts, and liver enzyme levels. It’s advisable to avoid strenuous exercise and manage stress levels before undergoing certain blood tests. Many people think that stress might cause blood in urine, possibly impacting test results. 
  • Interference from Hemolysis: Hemolysis refers to the breakdown of red blood cells, resulting in the release of their contents into the plasma or serum. Hemolysis can occur during blood collection or due to improper sample handling. It can affect the accuracy of various blood tests parameters, such as potassium, lactate dehydrogenase (LDH), and certain enzymes.
  • Pre-existing Medical Conditions: Certain medical conditions can interfere with blood test results. For example, kidney or liver diseases can impact various blood markers, leading to abnormal readings. It’s important to consider the patient’s medical history and conditions when interpreting blood test results.
  • Biological Variability: Normal biological variation among individuals can also lead to slight differences in blood test results. Factors such as age, sex, genetics, and underlying health conditions can influence the reference ranges for specific tests. Therefore, it’s crucial to interpret results in the context of the individual’s unique characteristics.

It’s important to remember that laboratory errors are relatively rare, and most inaccuracies in blood test results can be attributed to the abovementioned factors. 

To ensure accurate results, it’s essential to follow the recommended guidelines provided by your healthcare provider, disclose all relevant information, and adhere to any pre-test instructions. 

Consulting a qualified healthcare professional is crucial for properly interpreting blood test results and subsequent medical decision-making.

Can Blood Test Results Vary from Time to Time? 

Blood sample

Blood test results can change over time and, sometimes, within a month. The specific timeframe in which blood test results may change depends on various factors, including the specific blood marker being measured, the individual’s health status, and any medical interventions or treatments initiated.

Some blood markers can show changes quickly, even as little as a few hours or days. For instance, blood glucose levels can fluctuate significantly in response to diet, exercise, and medication adjustments. It’s important to know what to eat before a glucose test or to avoid it before the test totally. Similarly, white blood cell counts can vary in response to infections or inflammatory conditions.

Other blood markers may take longer to show significant changes. For instance, lipid profile (cholesterol) levels may take several weeks or months to respond to lifestyle modifications or medication interventions. Similarly, certain hormones may require several weeks for levels to stabilize or demonstrate changes.

Consulting with a qualified healthcare professional who can assess the trends and patterns in blood test results over time is important for accurate interpretation and appropriate medical decision-making.

Conclusion Common Misconceptions About Different Blood Tests Results

Blood tests

Understanding blood test results is crucial for accurate diagnosis and appropriate medical intervention. However, misconceptions about blood test results can lead to unnecessary anxiety, misdiagnosis, or inadequate treatment. 

It’s essential to remember that blood tests provide valuable information, but they should be interpreted based on an individual’s medical history, symptoms, and additional diagnostic evaluations. 

Always consult a qualified healthcare professional to understand your blood test results and their implications for your health.

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