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Lab Manual for Moffitt-Long and Mount Zion

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Platelet Count (Complete View)

Item Value
Test name Platelet Count
Test Update Information
Approval req'd? No
Available Stat? Yes
Utilization Guidelines
Test code PLT, CBC , CBCD, PLTM
Test group
Performed by Parnassus & Mt. Zion Hematology
Sendout?
In House Availability Test available 24 hours per day 7 days per week
Method Flow cytometry and/or Phase microscopy
Patient Preparation
Collection Instructions Collect the specimen in a blue top (citrate) tube if platelets are repeatedly found to clump in samples collected in a lavender top (EDTA).

When platelets clump in both EDTA and citrate tubes, and the count is < 100 and a physician specifically orders the procedure, a count will be run on a fingerstick sample collected directly into a Thrombo-tic¨.
Container type Lavender top
Amount to Collect 1 mL blood
Sample type EDTA whole blood
Preferred volume 1 mL blood
Min. Volume 250 µl in pedi-bullet
UCSF Rejection Criteria
Processing notes
Ref Lab Rejection Criteria
Units x109/L
Normal range 140-450 x109/L
Critical value ≤ 10 x109/L (always called)
≤ 25 x109/L Called if new finding within previous 24 hours.
Synonyms
Stability
Turn around times STAT 1 hour, Routine 4 hours
Reflex?
Additional information The less precise manual method is usually performed and billed (PLTM) when required by an intrinsic abnormality of the specimen.

In the presence of clumping, only platelet counts > 100 x109/L are reported.

Platelet estimates derived from a manual review of a peripheral blood slide are released only in cases in which the presence of white blood cell fragments and high numbers of giant platelets negate the use of both the automated machine and phase platelet analysis for generation of a platelet count. Manual platelet counts at low platelet values are subject to high precision errors because of the low number of platelets counted. Therefore, clinical correlation is advised.hhh
CPT coding
Medical Necessity? Yes. Click here for more information
LOINC code
LDT or Mod FDA?
Include for internal use?
Last Updated 2/21/2012 8:20:23 AM
Entry Number 750
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