Laboratory of Forensic Services
Serology Manual
Sacramento County District Attorney
SER: Seminal fluid – Semenogelin Rapid Stain Identification
(RSID) Semen Test
The Rapid Stain Identification (RSID)-Semen Test is a test for semenogelin, a
protein found in seminal fluid.
Principle
The RSID-Semen system consists of a cassette containing two monoclonal
antibodies specific to human semenogelin.
ve
d
An extract is prepared from the test sample and placed in the cassette. Any
reaction with both antibodies is recorded.
The identification of semenogelin in a stain confirms the presence of seminal
fluid.
Equipment
The following equipment is used for this procedure.
Reagents
ch
i
 microcentrifuge tubes
 sterile cotton swab
 pipettes
 barrier pipette tips
 timer.
The following prepared reagents are used in this procedure:
Ar
 RSID test cassettes
 RSID extraction buffer
 RSID running buffer
Controls
The following controls must be run with each set of casework samples:
 positive control (semen or seminal fluid stain)
 negative control (saline or RSID Extraction Buffer)
Continued on next page
Title:
Approved by:
Issue Date:
SER: Seminal Fluid – Semenogelin RSID
Laboratory Director
11/2011
Revision No:
Document Class:
2
LFS Policy/Procedure
All printed copies are uncontrolled. This document printed on 3/31/2015
Page 1 of 5
Laboratory of Forensic Services
Serology Manual
Sacramento County District Attorney
SER: Seminal fluid – Semenogelin Rapid Stain Identification
(RSID) Semen Test, Continued
Quality control
Each new lot of cassettes must be screened with a positive and negative
control to evaluate the “Test line” band. If problems are noted, the cassettes
from that lot will not be used for casework.
ve
d
A record of the quality check for new lot numbers including a photograph
documenting the results is kept in the Quality Control Log Book located in the
Biology Laboratory.
NOTE: Refer to the log book for previous minimum intensities observed for
the positive control band to determine whether a new lot of cassettes are
acceptable for casework.
Positive control
preparation
Use the following method to prepare a positive control.
Action
Add 50 l of known semen or seminal fluid to a sterile cotton
swab and let air dry.
Extract the entire swab in 1mL of saline or RSID Extraction
Buffer for 1-2 hours.
Add 1 l of extract to 99 l of RSID semen running buffer.
ch
i
Step
1
2
3
This entire volume will be used as the positive control.
Ar
To prepare and freeze pre-aliquoted positive control extracts for future use:
Step
1
2
3
Action
Perform the first two steps above.
Place 1 l of the extract and 19 l of deionized water or saline
into small tubes and freeze.
Prior to freezing, test one of the tubes in the batch to ensure that it
is working properly.
When preparing the positive control, thaw a 20 l aliquot.
Continued on next page
Title:
Approved by:
Issue Date:
SER: Seminal Fluid – Semenogelin RSID
Laboratory Director
11/2011
Revision No:
Document Class:
2
LFS Policy/Procedure
All printed copies are uncontrolled. This document printed on 3/31/2015
Page 2 of 5
Laboratory of Forensic Services
Serology Manual
Sacramento County District Attorney
SER: Seminal fluid – Semenogelin Rapid Stain Identification
(RSID) Semen Test, Continued
Sample
preparation
Prepare samples for analysis using the following procedure
2
3
Action
Extract the stain cutting (approximately 5 mm x 5 mm) or swab
(approximately one quarter) in 50 l of saline or RSID Extraction
Buffer for approximately 30 minutes.
Centrifuge the sample.
Pipette 20 l of the supernatant into a labeled microcentrifuge
tube.
ve
d
Step
1
Ar
ch
i
Continued on next page
Title:
Approved by:
Issue Date:
SER: Seminal Fluid – Semenogelin RSID
Laboratory Director
11/2011
Revision No:
Document Class:
2
LFS Policy/Procedure
All printed copies are uncontrolled. This document printed on 3/31/2015
Page 3 of 5
Laboratory of Forensic Services
Serology Manual
Sacramento County District Attorney
SER: Seminal fluid – Semenogelin Rapid Stain Identification
(RSID) Semen Test, Continued
Procedure
Use the following procedure to perform the RSID test.
NOTE: Each sample will require a separate cassette.
Step
1
Action
Prepare the positive control as stated above.
ve
d
Prepare the negative control by pipetting 20 l of saline or
extraction buffer into a labeled microcentrifuge tube.
Add 80 l of the running buffer to each of the controls and sample
tubes.
2
NOTE: If using freshly prepared positive control from above, do
not add additional buffer.
Add one of the 100 l samples to each sample window of the
cassettes and start timer.
After ten minutes, evaluate the cassettes.
3
ch
i
4
Record the results on the RSID Semen Cassette Worksheet.
NOTE: Due to High Dose Hook Effect (a false negative reaction when very
high levels are present in the sample), weakly positive and negative results
which are AP positive should be re-tested using the following steps.
Action
Add 1 l of the original sample extract to 99 l of running buffer.
Add the 100 l sample to the sample well of the cassette and
record the result at 10 minutes.
Ar
Step
1
2
Title:
Approved by:
Issue Date:
SER: Seminal Fluid – Semenogelin RSID
Laboratory Director
11/2011
Continued on next page
Revision No:
Document Class:
2
LFS Policy/Procedure
All printed copies are uncontrolled. This document printed on 3/31/2015
Page 4 of 5
Laboratory of Forensic Services
Serology Manual
Sacramento County District Attorney
SER: Seminal fluid – Semenogelin Rapid Stain Identification
(RSID) Semen Test, Continued
Interpretation
A visible red band at the Control (C) position only is a negative (-) result for
semenogelin.
A visible red band at both the Control (C) and Test (T) positions is a positive
(+) result for semenogelin which indicates the presence of seminal fluid.
References
ve
d
A visible red band at the Test (T) position only indicates a failed test and no
conclusions are reported.
The following references were used in developing these procedures.
Sato I, Kojima K, Yamasaki T, Yoshida K, Yoshiike M, Takano S, Mukai T,
Iwamoto T. “Rapid detection of semenogelin by one-step
immunochromatographic assay for semen identification.” J Immunological
Methods. 2004 Apr; 287(1-2): 137-45.
ch
i
Pang BC, Cheung BK. “Identification of human semenogelin in membrane
strip test as an alternative method for the detection of semen.” Forensic
Science International. 2006 Aug 29; 169(1):27-31.
Ar
Sato I, Yoshiike M, Yamasaki T, Yoshida K, Takano S, Mukai T, Iwamoto T.
“A dot-blot-immunoassay for semen identification using a polyclonal
antibody against semenogelin, a powerful seminal marker.” Forensic Science
International. 2001 Oct 15; 122(1):27-34.
Title:
Approved by:
Issue Date:
SER: Seminal Fluid – Semenogelin RSID
Laboratory Director
11/2011
Revision No:
Document Class:
2
LFS Policy/Procedure
All printed copies are uncontrolled. This document printed on 3/31/2015
Page 5 of 5