UK NEQAS for Antibiotic Assays

Distribution 2289 closing date 14-APR-2008

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	20.0	ALTM	20.1	100	1.01	5.03
Flucytosine	33.0	NS	30.3	9	3.53	11.66
Gentamicin	12.3	ALTM	11	251	1.17	10.6
Netilmicin	16.1	NS	15.1	8	1.43	9.47
Teicoplanin	41.2	ALTM	43	25	4.16	9.68
Tobramycin	3.5	ALTM	3.5	121	0.29	8.4
Vancomycin		ALTM	24.7	254	2.02	8.16

UK NEQAS for Antibiotic Assays

Distribution 2290 closing date 12-May-2008

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	2.5	NS	2.7	97	0.38	14.2
Flucytosine	80.0	NS	78.0	8	7.57	9.71
Gentamicin	7.9	ALTM	7.2	253	0.48	6.65
Netilmicin	4.0	NS	4.0	6	0.81	20.06
Teicoplanin	13.6	ALTM	14.3	25	1.03	7.23
Tobramycin	12.2	ALTM	12.4	117	1.4	11.30
Vancomycin	23.5	ALTM	22.8	253	1.88	8.25
*NS means the analyte was not scored

UK NEQAS for Antibiotic Assays

Distribution 2291 closing date 16-Jun-2008

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	25.0	ALTM	22.2	98	1.2	5.4
Flucytosine	71.0	NS	67.6	7	7.6	11.2
Gentamicin	1.4	ALTM	1.3	255	0.2	13.2
Netilmicin	13.7	NS	12.6	6	4.6	36.5
Teicoplanin	61.2	ALTM	59.7	23	3.9	6.6
Tobramycin	9.0	ALTM	9.4	118	0.9	9.3
Vancomycin	60.0	ALTM	59.4	254	5.8	9.7
*NS means the analyte was not scored

UK NEQAS for Antibiotic Assays

Distribution 2292 closing date 14-JUL-2008

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	15.6	ALTM	14.4	97	1.0	6.6
Flucytosine	118.0	NS	109.4	8	17.1	15.7
Gentamicin	10.5	ALTM	9.3	247	0.8	8.3
Netilmicin	7.5	NS	7.8	6	1.7	21.9
Teicoplanin	18.9	ALTM	19.2	25	1.5	7.6
Tobramycin	1.8	ALTM	1.9	116	0.2	9.3
Vancomycin	15.1	ALTM	15.4	251	1.2	7.1
*NS means the analyte was not scored

UK NEQAS for Antibiotic Assays

Distribution 2293 closing date 18-AUG-2008

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	57.0	ALTM	50.7	95	4.1	8.1
Flucytosine	51.0	NS	48.6	9	6.7	13.8
Gentamicin	6.7	ALTM	6.2	256	0.6	9.6
Netilmicin	2.4	NS	2.6	4	0.4	16.0
Teicoplanin	3.0	NS	2.9	22	0.7	25.5
Tobramycin	10.1	ALTM	10.5	115	1.0	9.9
Vancomycin	44	ALTM	43.7	253	3.5	8.0

UK NEQAS for Antibiotic Assays

Distribution 2294 closing date 15-SEP-2008

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	13.8	ALTM	12.7	96	0.8	6.1
Flucytosine	92.0	NS	72.0	8	21.1	29.3
Gentamicin	15.4	ALTM	14.3	238	1.2	8.2
Netilmicin	11.3	NS	10.2	5	1.0	9.5
Teicoplanin	45.6	ALTM	45.5	24	3.6	7.8
Tobramycin	6.4	ALTM	6.5	116	0.5	8.1
Vancomycin	28.6	ALTM	28.8	250	2.3	8.0
*NS means the analyte was not scored

UK NEQAS for Antibiotic Assays

Distribution 2295 closing date 13-OCT-2008

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	30.0	ALTM	26.3	92	1.6	6.2
Flucytosine	63.5	NS	61.8	8	4.4	7.1
Gentamicin	3.1	ALTM	2.9	248	0.2	6.1
Netilmicin	7.2	NS	6.9	4	0.7	10.7
Teicoplanin	8.9	ALTM	9.3	23	0.9	10.2
Tobramycin	14.9	ALTM	16.5	114	1.5	9.3
Vancomycin	6.6	ALTM	6.7	248	0.8	11.3
*NS means the analyte was not scored

UK NEQAS for Antibiotic Assays

Distribution 2296 closing date 10-NOV-2008

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	20.5	ALTM	18.4	101	1.0	5.4
Flucytosine	36.0	NS	25.4	7	11.5	45.3
Gentamicin	12.1	ALTM	11.0	250	1.2	10.8
Netilmicin	15.8	NS	12.7	5	4.1	32.7
Teicoplanin	18.4	ALTM	18.3	24	1.5	8.1
Tobramycin	4.4	ALTM	4.4	121	0.5	10.2
Vancomycin	40.0	ALTM	40.2	255	3.8	9.3
*NS means the analyte was not scored

UK NEQAS for Antibiotic Assays

Distribution 2297 closing date 15-DEC-2008

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	4.8	ALTM	4.8	94	0.4	8.0
Flucytosine	77.0	NS	77.0	9	9.7	14.8
Gentamicin	9.2	ALTM	9.2	243	0.6	6.8
Netilmicin	3.1	NS	3.1	4	0.5	19.9
Teicoplanin	58.4	ALTM	58.4	25	4.9	8.9
Tobramycin	12.4	ALTM	12.4	114	1.2	9.7
Vancomycin	21.3	ALTM	21.3	247	1.8	7.9
*NS means the analyte was not scored

UK NEQAS for Antibiotic Assays

Distribution 2298 closing date 19-JAN-2009

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	22.0	ALTM	19.9	98	1.2	5.9
Flucytosine	62.0	NS	62.8	7	7.7	12.3
Gentamicin	0.3	NS	0.4	197	0.1	28.2
Netilmicin	12.5	NS	14.6	5	7.3	50.2
Teicoplanin	30.1	ALTM	29.2	25	1.8	6.1
Tobramycin	7.6	ALTM	7.7	122	0.7	8.6
Vancomycin	67.0	ALTM	66.5	246	5.9	8.9
*NS means the analyte was not scored

UK NEQAS for Antibiotic Assays

Distribution 2299 closing date 16-FEB-2009

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	18.0	ALTM	17.7	100	1.0	5.9
Flucytosine	132.0	NS	121.7	8	18.9	15.6
Gentamicin	10.3	ALTM	9.5	245	0.7	7.3
Netilmicin	9.2	NS	7.9	4	0.9	11.7
Teicoplanin	8.4	ALTM	8.7	26	1.0	11.8
Tobramycin	1.2	ALTM	1.2	124	0.2	15.4
Vancomycin	13.5	ALTM	14.0	249	1.0	7.3
*NS means the analyte was not scored

UK NEQAS for Antibiotic Assays

Distribution 2300 closing date 16-MARCH-2009

Weighed-in concentrations and All-laboratory Trimmed Means (ALTM)

Analyte	Weighed-in (mg/L)	Target*	ALTM (mg/L)	Returns	SD	CV%
Amikacin	56.0	ALTM	53.9	95	4.7	8.8
Flucytosine	48.0	NS	47.4	8	3.6	7.5
Gentamicin	5.0	ALTM	4.6	246	0.3	6.4
Netilmicin	2.1	NS	2.3	5	0.2	6.7
Teicoplanin	21.2	ALTM	17.8	27	1.6	8.9
Tobramycin	11.2	ALTM	10.6	121	1.0	9.4
Vancomycin	50.0	ALTM	49.4	243	4.5	9.1
*NS means the analyte was not scored

Weighed-in concentration

The weighed-in concentration (mg/L) is given for information only. It is published three days after the distribution closes and can be used to give a guide to individual laboratory performance. ALTM values (mg/L) and statistics are published as soon as they are available.

Target

The ALTM is used as the target concentration by the Scheme for determination of laboratory performance for all analytes

The weighed-in values are also available by telephone (recorded message) on INT+UK+117 9505050 Extension 2269