Pseudothrombocytopenia due to Platelet Clumping: A Case Report and Brief Review of the Literature

Table 1

Patient’s CBC and platelet counts over the period of care and follow-up.

Chronology of follow-up testing	Platelet count, ×10^3/uL	WBC; K/cu mm	RBC; M/cu mm	Hgb; g/dL	Collection tube additive	Collection method	Collection volume
Follow-up
Day 1	165	8.8	5.02	15.0	EDTA	Unknown	Unknown
Day 110	106	8.0	5.05	14.6	EDTA	Venipuncture	3 mL
Day 117	87	8.2	4.78	14.1	EDTA	Venipuncture	3 mL
Day 124	88	8.0	5.00	14.7	EDTA	Venipuncture	3 mL
Day 155	Unable to report, platelet clumps	6.6	4.75	14.1	EDTA	Venipuncture	3 mL
Day 156	85	5.0	4.65	13.6	EDTA	Venipuncture	3 mL
Day 188	Unable to report, platelet clumps	4.6	4.70	13.6	EDTA	Venipuncture	3 mL
Day 202	Unable to report, platelet clumps	7.7	4.89	14.4	Na citrate	Venipuncture	2.7 mL
					EDTA		3 mL
Day 216	184	8.4	4.88	14.3	Heparin	Venipuncture	3 mL

Encounter described in this case report.
Sample collection in a heparin tube was noted in records but could not be verified.