Tai D Y, Chan K W, Chee Y C, Mak K H
Department of General Medicine, Tan Tock Seng Hospital, Singapore.
Singapore Med J. 1995 Jun;36(3):263-6.
Platelet counts (PC) obtained simultaneously from capillary blood (CB) are generally lower than those from venous blood (VB). We quantified this difference in 17 patients with low platelet counts (LPC) and 18 healthy volunteers with normal platelet counts (NPC). The reproducibility of the counts in these 2 groups of subjects was also evaluated. The mean venous platelet count (VPC) and the mean capillary platelet count (CPC) were 67 +/- 30 x 10(3)/ul (+/- SD) and 61 +/- 23 x 10(3)/ul (p = 0.012) in the LPC, and 264 +/- 44 x 10(3)/ul and 234 +/- 45 x 10(3)/ul (p = 0.00016) in the NPC respectively. The mean difference (d) in the PC between VB and CB were 9.4 +/- 13.1 x 10(3)/ul and 19.4 +/- 17.6 x 10(3)/ul in the LPC and NPC respectively. The coefficients of variation (CV) of double counts for VB and CB were 8.1 +/- 8.3% and 9.8 +/- 8.6% for LPC, and 2.3 +/- 1.6% and 2.5 +/- 2.2% for NPC respectively. In conclusion, VPC was frequently (82.9% or 29/35 cases) higher than CPC. In addition, in patients with LPC, the agreement between VPC and CPC was poor and the counts were less reproducible.
同时从毛细血管血（CB）中获得的血小板计数（PC）通常低于静脉血（VB）中的血小板计数。我们对17例血小板计数低（LPC）的患者和18例血小板计数正常（NPC）的健康志愿者的这种差异进行了量化。还评估了这两组受试者计数的可重复性。LPC组的平均静脉血小板计数（VPC）和平均毛细血管血小板计数（CPC）分别为67±30×10³/μl（±标准差）和61±23×10³/μl（p = 0.012），NPC组分别为264±44×10³/μl和234±45×10³/μl（p = 0.00016）。LPC组和NPC组中VB与CB之间PC的平均差异（d）分别为9.4±13.1×10³/μl和19.4±17.6×10³/μl。LPC组中VB和CB重复计数的变异系数（CV）分别为8.1±8.3%和9.8±8.6%，NPC组分别为2.3±1.6%和2.5±2.2%。总之，VPC经常（82.9%或29/35例）高于CPC。此外，在LPC患者中，VPC与CPC之间的一致性较差，且计数的可重复性较低。
