Skip to main content

Translate

Falsely High Prolactin level: A Diagnostic Pitfalls

Prolactin (PRL) is a hormone produced by the pituitary gland in the brain that plays a role in lactation and reproduction.  The elevation of serum PRL levels (hyperprolactinemia) has multiple etiologies that can be divided into physiological, pharmacological, and pathological causes. 
There are several potential reasons for a falsely high prolactin level in a blood sample. Prolactin levels of women were significantly higher in the morning than those in the evening. Prolactin is secreted in a circadian and pulsatile pattern. Serum prolactin level reaches its maximum in the early morning hours, returns to the normal value one hour after waking up, and is lower in the evening than that in the morning. Prolactin is often measured in the early morning hours along with other tests that require fasting and is affected by the physiological morning peak. So, it can be falsely higher than the normal range and can lead to further unnecessary investigations. 
Certain medications can falsely increase prolactin levels. For example, antipsychotic medications, some antidepressants, anti-hypertensive drugs, and acid-reducing medications, can also potentially cause elevated prolactin levels.
Underactive thyroid gland (hypothyroidism) can disrupt the hormonal balance in the body, leading to elevated prolactin levels.
Intense physical activity or emotional stress just prior to blood collection can stimulate the release of prolactin, leading to a falsely high result. It's important to be in a relaxed state during blood collection to minimize the risk of stress-induced prolactin elevation.
Recent sexual activity or nipple stimulation can cause a temporary increase in prolactin levels. Therefore, blood samples taken shortly after sexual activity or nipple stimulation may yield a falsely high prolactin level.
It is recognized that a substantial proportion of patients found to have raised prolactin (PRL) level on a single testing is subsequently found to have normal PRL levels. Though this is often attributed to stress or medication factor, it should be noted, that PRL secretion displays diurnal variation. It is recommended that screening for hyperprolactinemia includes three specimens be obtained at 20- to 30-minute intervals in mid-morning. Each sample can either be analyzed separately or be pooled into a single specimen. When a drug-induced rise in PRL is suspected, PRL sampling should be repeated after withdrawal of medications for at least 72 h, if possibile. 
It's important to note that a single blood test indicating high prolactin levels may not be enough for a definitive diagnosis. Further evaluation, including medical history, physical examination, and additional testing, may be necessary to determine the underlying cause of hyperprolactinemia. 

Labels:

Comments

Post a Comment

Popular posts from this blog

The Pitfalls of Routine Health check-ups During Acute Illness: What You Need to Know

Preventive health check-ups , which typically include a series of blood tests, play a crucial role in maintaining overall well-being. These check-ups help identify potential health issues early, allowing for timely intervention. However, while these screenings are essential, the timing of when you undergo them is equally important. Getting routine blood tests during an acute illness—such as the flu, a stomach bug, or even a common cold—can lead to misleading results and unnecessary concerns. Here’s why it’s best to delay preventive health check-ups until after you've fully recovered from an acute illness. Understanding Acute Illness and Its Impact on Blood Tests: An acute illness refers to a sudden onset condition that usually lasts for a short period. Common examples include the flu, fever, a cold, or gastroenteritis (Vomiting, Diarrhoea). Although these illnesses are temporary, they cause significant changes in the body’s physiology as it works to fight off the infection or infla...
Post a Comment
Read more

High Urine Sugar and Normal Blood Sugar: Uncovering the Mysteries of Glycosuria

  Glycosuria , the presence of glucose in urine, is commonly associated with diabetes, where high blood sugar levels lead to the spillage of glucose into the urine. However, a perplexing scenario arises when glycosuria occurs alongside normal blood sugar levels. This intriguing condition challenges conventional medical understanding and prompts a deeper exploration into its causes and implications. Under normal circumstances, the kidneys filter blood, reabsorbing glucose back into the bloodstream and preventing its excretion in urine. Glycosuria typically indicates a disruption in this process, often linked to hyperglycemia (high blood sugar levels). But when blood glucose levels are within normal ranges, the puzzle deepens. Possible Causes of Glycosuria with Normal Blood Sugar:  Several conditions and factors can lead to this unusual phenomenon: Renal Glycosuria: A rare inherited condition where the renal tubules are unable to reabsorb glucose efficiently, leading to its pre...
Post a Comment
Read more

From Collection to Analysis: Why Blood Samples Need the Cold Chain

In the field of laboratory medicine, precision is paramount. From sample collection to final analysis, every step must be carefully controlled to ensure that test results are accurate and reliable. One often underestimated but critical aspect of this chain is the maintenance of the cold chain during storage and transportation of blood samples . A lapse at this stage can compromise sample integrity, leading to erroneous results that may adversely affect patient diagnosis and treatment. The cold chain refers to the temperature-controlled supply chain that ensures biological samples like blood, plasma, and serum are kept within specified temperature ranges from the point of collection through storage and transportation until they reach the testing laboratory. Depending on the type of sample and required tests, the temperature may vary. Maintaining these temperatures prevents the degradation of blood components and preserves the biochemical and cellular characteristics essential for accur...
Post a Comment
Read more