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Platelet Count in Serum/Plasma (Qualitative or Quantitative Screening/Confirmation)

Published: August 9, 2026Updated: August 16, 2026

This test measures the number of platelets (a type of blood cell) in your serum or plasma. It helps assess bleeding risks, detect clotting disorders, or monitor treatments.

Quick summary

["Platelets help prevent excessive bleeding and support blood clotting—this test checks their levels for health concerns."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
45370-4
Short code
Platelet Xmatch SerPl-Imp
Synonyms
Platelet Xmatch SerPl-Imp
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
150
Ref high
400
Critical range
50 N/A – 1000 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85049
SNOMED
900000000000003003
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test if you have symptoms like unusual bruising, prolonged bleeding, or unexplained fatigue. It’s also used before surgeries, during chemotherapy, or if you have conditions like anemia or autoimmune diseases.

What to Expect Before the Test

No special preparation is needed, but inform your doctor about medications (e.g., blood thinners) or recent injuries. Blood is drawn from a vein, usually in your arm.

What the Results Mean

Results are compared to a standard range for your age/health. Low platelet counts may indicate bleeding disorders, infections, or medications. High counts could signal clotting risks or inflammation.

Common Conditions Affecting Platelets

Conditions like leukemia, liver disease, or vitamin deficiencies can alter platelet levels. Chronic illnesses or certain drugs (e.g., chemotherapy) may also impact them.

Reference range

Adult: 150-400 x 10^9/LN/A

Specimen: serum

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Platelet counts guide treatment decisions—low levels may require blood transfusions or medication adjustments, while high levels may prompt anti-clotting therapies.

Short name

Platelet Screening/Confirmation

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–2 business days, depending on lab processing. Follow-up with your doctor if you have concerns about your results.
Can I eat or drink before this test?
Yes, you can eat and drink normally. Avoid alcohol 24 hours before testing, as it may affect platelet counts.
Does this test require fasting?
No fasting is required for this test. However, inform your doctor about all medications, supplements, or recent injuries to ensure accurate results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy