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Lab Test Dictionary

Platelet Transmission Electron Microscopic Study (PTEM)


Platelet Ultra-Structural Exam by Transmission Electron Microscopy


Microscopy; Platelet EM

Specimen Type

Whole Blood

Performing Lab

Mayo Medical Lab

Epic ID


Lab Test Days

Monday-Friday; 0700-1500

Standard TAT

10 Days

Collection Information

Specimen Required

3-6 mL Whole Blood

Container Type

Yellow (ACD), Solution B

Collection Instructions

Collect Monday-Thursday 0900-1300 only, it can be collected on a weekend as long as it can be delivered within 72 Hours of collection and no holidays. Whole blood collected in an ACD Solution A (yellow-top) tube is also acceptable. Submit a completed Platelet EsotericTesting Patient Info form with specimen to lab.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 72 Hours; Refrigerated: Unacceptable; Frozen: Unacceptable

Rejection Criteria

Gross hemolysis; Later than 96 Hours from collection

Test Volume Required

6 mL Whole Blood

Minimum Test Volume

3 mL Whole Blood

Processing Instructions

Submit a completed Platelet Esoteric Testing Patient Info form with specimen room temp. Order in Mayolink and send with Mayo Courier Monday-Thursday only.


Insurance authorization is required prior to draw for Outpatients. Ok to send on Inpatients.

CPT Codes

85390, 88348 (Only need insurance authorization for genetic cpt: 88348)