Table 1.

Difference in time to identification (TTI) between the standard protocol and MALDI protocol

Organism or group	No. of isolates	Mean no. of days isolate identified earlier	Proportion (%) identified earlier by the MALDI protocol after the following no. of days of workup:
			<0a	0b	1	2	3	4	5	6	>6
Staphylococcus aureus	109	1.35		1.8	66.1	28.4	2.8	0.9
Other staphc	26	1.19		7.7	65.4	26.9
BHSd	72	0.60	1.4	38.9	58.3	1.4
VGSe	7	0.57		42.9	57.1
Streptococcus anginosus	17	1.12		41.2	29.4	5.9	23.5
Streptococcus pneumoniae	6	0.33		66.7	33.3
Other GPCf	6	3.33		33.3	16.7	16.7				16.7	16.7
Enterococcus sp.	78	1.64		1.3	51.3	34.6	9.0	2.6	1.3
Enterobacteriaceae	284	1.34		2.8	69.4	23.2	2.1	1.1	1.1	0.4
Pseudomonas aeruginosa	77	1.82			41.6	49.4	2.6	1.3	2.6	2.6
Other NF GNBg	39	2.59		2.6	30.8	35.9	2.6	15.4	5.1	5.1	2.6
Haemophilus sp.	10	1.40			80.0		20.0
Other GNCBh	7	0.14		85.7	14.3
Corynebacterium sp.	9	1.67		22.2	33.3	22.2		22.2
Other GPRi	8	4.13	12.5		37.5			12.5			37.5
Anaerobic GNj	26	2.54		3.8		65.4	7.7	19.2		3.8
Anaerobic GPk	14	2.64		21.4	14.3	28.6	7.1	7.1		14.3	7.1
Candida albicans	52	0.04	3.8	92.3	1.9		1.9
Other Candida sp.	56	1.93		8.9	67.9	7.1	3.6	3.6	3.6		5.4
Other yeasts	8	3.75				25.0	37.5	12.5		12.5	12.5
All organismsl	911	1.45	0.4	13.5	52.7	23.6	3.7	2.7	1.1	1.1	1.1

^aProportion identified earlier by standard protocol (range, 1 to 2 days).

^bProportion identified where the TTI by MALDI and standard protocols were equal.

^cOther staph, staphylococci other than S. aureus.

^dBHS, beta-hemolytic Streptococcus.

^eVGS, viridans group Streptococcus.

^fGPC, Gram-positive cocci.

^gNF GNB, non-glucose-fermenting Gram-negative bacilli.

^hGNCB, fastidious Gram-negative coccobacilli.

ⁱGPR, Gram-positive rod.

^jAnaerobic GN, anaerobic Gram-negative bacteria.

^kAnaerobic GP, anaerobic Gram-positive bacteria.

^lThe total values for all organisms are shown in boldface type.