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Table. 3. Table 3

Parameters of delta checks in participant laboratories

Test	Number of labs performing delta check (%)	Time interval (month)	Delta check method
Test	Number of labs performing delta check (%)	Time interval (month)	DPC	DD	RD	RPC	RCV	Random
AFP (N = 84)	30 (35.7%)	1	3 (10.0)					1 (3.3)
		3	5 (16.7)	1 (3.3)
		6	4 (13.3)				1 (3.3)
		12	2 (6.5)
		no limit	10 (33.3)	1 (3.3)	1 (3.3)			1 (3.3)
		Total	24 (80.0)	2 (6.7)	1 (3.3)		1 (3.3)	3 (10.0)
CA125 (N = 79)	27 (34.2%)	1	2 (7.4)
		3	5 (18.5)	1 (3.7)
		6	4 (14.8)				1 (3.7)
		12	2 (7.4)
		no limit	12 (44.4)
		Total	25 (92.6)	1 (3.7)			1 (3.7)
CA19-9 (N = 82)	28 (34.1%)	1	2 (6.9)
		3	3 (10.3)	1 (3.4)
		6	4 (13.8)				1 (3.4)
		12	2 (6.9)
		no limit	13 (44.8)		1 (3.4)			1 (3.4)
		Total	24 (82.8)	1 (3.4)	1 (3.4)		1 (3.4)	1 (3.4)
CEA (N = 84)	30 (35.7%)	1	3 (10.0)
		3	4 (13.3)	1 (3.3)
		6	4 (13.3)	1 (3.3)			1 (3.3)
		12	2 (6.7)
		no limit	11 (36.7)	1 (3.3)	1 (3.3)			1 (3.3)
		Total	24 (80.0)	3 (10.0)	1 (3.3)		1 (3.3)	1 (3.3)
PSA (N = 85)	33 (38.8%)	1	3 (9.1)					1
		3	5 (15.2)	2 (6.1)
		6	4 (12.1)	1 (3.0)			1 (3.0)
		12	1 (3.0)
		no limit	11 (33.3)	2 (6.1)	1 (3.0)			1 (3.0)
		Total	24 (72.7)	5 (15.2)	1 (3.0)		1 (3.0)	3 (9.1)
TSH (N = 86)	32 (37.2%)	1	2 (6.3)	3 (9.4)				1 (3.1)
		3	2 (6.3)	2 (6.3)		3 (9.4)
		6	3 (9.4)				1 (3.1)
		12	1 (3.1)
		no limit	13 (40.6)					1 (3.1)
		Total	21 (65.6)	5 (15.6)		3 (9.4)	1 (3.1)	2 (6.3)
T3 (N = 86)	32 (37.2%)	1	2 (6.3)					1 (3.1)
		3	2 (6.3)	2 (6.3)		3 (9.4)
		6	3 (9.4)	2 (6.3)			1 (3.1)
		12	2 (6.3)
		no limit	13 (40.6)					1 (3.1)
		Total	22 (68.8)	4 (12.5)		3 (9.4)	1 (3.1)	2 (6.3)
free T4 (N = 86)	32 (37.2%)	1	2 (6.3)					1 (3.1)
		3	2 (6.3)	2 (6.3)		3 (9.4)
		6	3 (9.4)	2 (6.3)			1 (3.1)
		12	2 (6.3)
		no limit	13 (40.6)					1 (3.1)
		Total	22 (68.8)	4 (12.5)		3 (9.4)	1 (3.1)	2 (6.3)

Abbreviations: AFP, alpha-fetoprotein; CA125, cancer antigen 125; CA19-9, cancer antigen 19-9; CEA, carcinoembryonic antigen; DD, delta difference; DPC, delta percent change; Labs, laboratories; PSA, prostate-specific antigen; RCV, reference change value; RPC, rate percent change; TSH, thyroid-stimulating hormone; T3, triiodothyronine; T4, thyroxine.

Lab Med Online 2023;13:324~331 https://doi.org/10.47429/lmo.2023.13.4.324