. 2018 Feb 25;32(5):e22390. doi: 10.1002/jcla.22390

Table 5.

Ascorbic acid interference on tested analytes on iChem Velocity and Combur‐10M dipsticks

Analyte	Analyte concentration (mg/dL) iChem Velocity reported category^a Combur‐10M reported category^b	Ascorbic acid concentration	iChem Velocity	Combur‐10M
Glucose	50 1+^a 1+^b	0	Normal	1+
		20	Normal	Normal
		50	Normal	Normal
		100	Normal	Normal
		200	Normal	Normal
		500	Normal	Normal
	100 2+^a 2+^b	0	1+	2+
		20	1+	1+
		50	1+	1+
		100	1+	Normal
		200	1+	Normal
		500	1+	Normal
	300 3+^a 3+^b	0	2+	3+
		20	2+	2+
		50	2+	3+
		100	2+	2+
		200	2+	2+
		500	Normal	2+
Hemoglobin	0.03 2+^a 2+^b	0	2+	2+
		20	1+	Negative
		40	1+	Negative
		200	Negative	Negative
		500	Negative	Negative
	0.06 3+^a 3+^b	0	2+	2+
		20	1+	2+
		40	1+	2+
		200	Negative	1+
		500	Negative	Negative
	0.10 3+^a 3+^b	0	2+	3+
		20	2+	3+
		40	1+	3+
		200	Negative	3+
		500	Negative	Negative
Nitrite	0.10 Negative^a Negative^b	0	Positive	Negative
		20	Negative	Negative
		40	Negative	Negative
		200	Negative	Negative
		500	Negative	Negative
	0.20 Positive^a Positive^b	0	Positive	Positive
		20	Positive	Positive
		40	Negative	Positive
		200	Negative	Positive
		500	Negative	Negative
Bilirubin	1.8 1+^a 1+^b	0	2+	3+
		20	1+	2+
		40	Negative	1+
		200	Negative	1+
		500	Negative	Negative
	4.0 2+^a 2+^b	0	2+	3+
		20	2+	3+
		40	1+	2+
		200	1+	2+
		500	Negative	1+

Highlighted fields present interference points stated by the manufacturers.