Table 4.

Number of undocumented blood glucose tests and number of transcription errors among the 5049 tests analyzed.

Source	Undocumented tests, n (%)	Tests analyzed for errors, n	Errors among tests analyzed, n (%)	Range of error, mg/dL (mmol/L)a	Error rate per patient (N=234)
Paper log	608 (12.04)	4441	98 (2.21)	–92 to 92 (–5.1 to 5.1)	0.4 (98/234)
Vital signs flow sheet	2064 (40.88)	2985	242 (8.11)	–110 to 80 (–6.1 to 4.4)	1.0 (242/234)
Both	239 (4.73)	2616	43 (1.64)	N/Ab	0.2 (43/234)

^aRange of difference between the correct blood glucose value and the erroneously transcribed value.

^bN/A: not applicable.