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Table 2 Ragweed extract data from HollisterStier and Stallergenes Greer

From: Comparison of weight per volume and protein nitrogen units in non-standardized allergen extracts: implications for prescribing subcutaneous immunotherapy

RAGWEED

Corresponding PNU/mL

HollisterStier (n = 16)

Stallergenes Greer (n = 5)

Wt/volume (1:100)

Wt/volume (1:200)

Wt/volume (1:100)

Wt/volume (1:200)

A

 Lowest value

14,800.00

7400.00

15,000.00

7500.00

 Highest value

23,500.00

11,750.00

18,000.00

9000.00

 Mean

17,443.75

8721.88

16,360.00

8180.00

 St. deviation

2593.98

1296.99

1209.30

604.65

RAGWEED

Corresponding diluent (mL)

HollisterStier (n = 16)

Stallergenes Greer (n = 5)

PNU (1000)

PNU (2000)

PNU (3000)

PNU (4000)

PNU (5000)

PNU (1000)

PNU (2000)

PNU (3000)

PNU (4000)

PNU (5000)

B

 Lowest value

1480.00

740.00

493.33

370.00

296.00

1500.00

750.00

500.00

375.00

300.00

 Highest Value

2350.00

1175.00

783.33

587.50

470.00

1800.00

900.00

600.00

450.00

360.00

 Mean

1744.38

872.19

581.46

436.09

348.88

1636.00

818.00

545.33

409.00

327.20

 St. deviation

259.40

129.70

86.47

64.85

51.88

120.93

60.46

40.31

30.23

24.19

  1. Corresponding PNU concentrations for a weight per volume of 1:100 and 1:200 are shown A, while corresponding diluent volumes for PNUs values from 1000 to 5000 are shown in B. These volumes represent the amount of diluent or buffer added to 1 g of allergen