Table 4. Specifications for imprecision, inaccuracy and allowable total error.

	Desirable specification			Optimal specification
	I (%)	B (%)	TE (%)	I (%)	B (%)	TE (%)
Serum creatinine	3.0	4.0	8.9	2.8	3.2	7.7
Creatinine, concentration, first morning urine	11.6	8.7	27.8	NA	NA	NA
Total protein, 24 hour urine	17.8	10.7	40.0	8.9	5.3	20.0
Albumin, concentration, first morning urine	18.0	16.4	46.1	9.9	7.0	23.3
I – specification for imprecision. B – specification for inaccuracy. TE – specification for allowable total error. NA – not applicable.