Chemiluminescence

SERUM (1ML) For a Serum Pooled Prolactin (PRL) test, collect 1 ml of serum in 3 separate tubes, ensuring an exact 20-minute gap between each draw.

PROCEDURE OF SAMPLING AND FURTHER PROCESS:

The success and accuracy of the Pooled Prolactin Test heavily rely on a strict adherence to a specific collection protocol.

1. PATIENT PREPARATION (Before Lab Visit/Home Collection):

* Avoid Stressors: The patient should be advised to avoid strenuous exercise, breast/nipple stimulation, and sexual activity for at least 24 hours prior to the test. These activities can physiologically increase prolactin levels.

* Medication Disclosure: The patient must inform their doctor about all medications they are taking, as many drugs (e.g., certain antipsychotics, antidepressants, blood pressure medications, estrogens) can elevate prolactin levels. The doctor will decide if any medication needs to be paused, though this is rare.

* No Fasting: Fasting is not required.

2. SAMPLING PROCEDURE (At the Collection Center or Home):

* Rest Period: Upon arrival at the collection site (or before the phlebotomist begins at home), the patient will be asked to sit or lie down quietly and rest calmly for a minimum of 20 to 30 minutes. This crucial resting period helps to minimize any stress-induced elevation of prolactin caused by traveling to the lab or anxiety about the blood draw.

* First Sample Collection (T0): After the initial rest period, the first blood sample (e.g., 3mL for 1mL serum yield) is drawn using standard venipuncture technique into a Red Top or SST tube. The exact time of this first draw is noted.

* Subsequent Rest Periods: The patient is asked to remain resting quietly in the same position (sitting or lying down).

* Second Sample Collection (T15-20 min): Approximately 15 to 20 minutes after the first draw, the second blood sample is collected into a separate Red Top or SST tube. The exact time of this second draw is noted.

* Third Sample Collection (T30-40 min): Approximately 15 to 20 minutes after the second draw (i.e., 30-40 minutes after the first draw), the third blood sample is collected into a third Red Top or SST tube. The exact time of this third draw is noted.

* Gentle Handling: All blood samples should be handled gently to avoid hemolysis.

3. FURTHER PROCESSING (In the Laboratory):

* Clotting: Immediately after collection, all three blood tubes are allowed to clot at room temperature for the recommended time (typically 15-30 minutes).

* Centrifugation: Within one hour of collection, each tube is centrifuged (spun at high speed) to separate the serum from the blood cells.

* Aliquot and Storage: The separated serum from each of the three tubes is then carefully aliquoted (transferred into smaller, labeled tubes). If not analyzed immediately, these serum aliquots must be frozen promptly at -20°C or colder. This rapid freezing is essential to preserve the stability of the prolactin hormone.

* Transportation: If the samples are being sent to a central lab for analysis, they must be transported frozen on dry ice or with sufficient cold packs to maintain freezing conditions throughout transit.

4. ANALYSIS (At the Testing Laboratory):

* Thawing and Analysis: Upon arrival at the testing lab, the frozen serum aliquots are thawed.

* Chemiluminescence Immunoassay: Each of the three serum samples is individually analyzed using the Chemiluminescence (CMIA/CLIA) immunoassay.

* Result Generation: The instrument provides a precise quantitative prolactin value for each of the three samples.

5. REPORTING:

* The lab will typically report the individual prolactin levels for each of the three timed samples (e.g., Sample 1: X ng/mL, Sample 2: Y ng/mL, Sample 3: Z ng/mL).

* In some cases, the lab might also provide an average of the three readings, but individual values are crucial for interpreting the "trend" (e.g., if the first sample was high but subsequent ones dropped).

* The results will be delivered within 12 Hours of the final sample's receipt and processing.

Is fasting required for pooled prolactin test?

Yes, fasting for 8-12 hours is recommended. Prolactin levels can rise after meals, so a fasting sample ensures accuracy.

How is the pooled prolactin sample collected?

Three blood samples are drawn at 20-minute intervals and pooled together to account for prolactin's pulsatile secretion, providing a more accurate average level.

What is the turnaround time for results?

Results are available within 24 hours via verified PDF on our website or WhatsApp/email.

What do high prolactin levels indicate?

Elevated prolactin (hyperprolactinemia) can cause infertility, irregular periods, galactorrhea, and may indicate pituitary tumors (prolactinomas) or hypothyroidism.

Can medications affect prolactin levels?

Yes, antipsychotics, antidepressants, antiemetics, and some blood pressure medications can raise prolactin. Inform your doctor about all medications before testing.

Does stress impact prolactin results?

Stress, exercise, and sleep can temporarily elevate prolactin. For accurate pooled testing, rest quietly before and between sample collections.