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Biomedical subjects

P Schultz-Larsen

Publications and source records attributed to P Schultz-Larsen.

10 recordsLinked to original sources
PubMed1985

Screening in pregnancy with unconjugated estriol compared with total estriol.

An obstetric population was screened 'blind' by measuring unconjugated estriol (ucE3) and total estriol (tE3) in serum. The purpose was firstly to ascertain the predictive values of ucE3 for the prediction of low birth weight and distressed neonates (perinatal deaths included), and secondly to compare the predictive values of ucE3 and tE3. The main material consisted of 1018 singleton pregnancies with known term, who would not have undergone estriol (E3) measurement had it not been for this investigation. The study was carried out prospectively, and the obstetricians had no knowledge of the E3 values in the screened pregnancies. When at least one of the ucE3 values was low, the risk of having a small for gestational age (SGA) infant was 22%. Low tE3 implied a 27% risk. When both were low, the risk of a SGA infant was 54%. The percentages of SGA infants found were 18, 19, and 12%, when ucE3, tE3, or both respectively, were low. ucE3 does not appear to be superior to tE3. From the predictive values found in this study, screening of a total obstetric population with ucE3 and/or tE3 cannot be recommended.

Adult↗
PubMed1983

Human placental lactogen, pregnancy-specific beta-1-glycoprotein and alpha-fetoprotein in serum in threatened abortion.

The predictive value of HPL, SP1 and AFP in serum were determined in 109 women admitted to hospital because of vaginal bleeding in the 6th to 19th gestational week. The prediction of abortion based on the initial analysis from the day of admission was found to be 91.7%, 75.9% and 81.8% for HPL, SP1 and AFP, respectively. The corresponding values for prediction of successful outcome were 68.7%, 73.6% and 65.4%. The HPL and AFP determinations were, however, found to be valid only after the 9th and 12th gestational week, respectively. A highly significant positive correlation (r = 0.84, P less than 0.001) was demonstrated between HPL and SP1 suggesting that SP1 measurements might replace HPL in the evaluation of the prognosis in threatened abortion.

Abortion, Threatened↗
PubMed1982

Comparative assays in three laboratories of serum specimens containing pregnancy-specific beta 1 glycoprotein with different proportions of the alpha variant.

Following several reports that the alpha component of pregnancy-specific beta 1 glycoprotein (SP1) gives dose-response curves that are flatter than those of the beta component when assayed by radioimmunoassay of the competitive type, a collaborative study was carried out by 3 laboratories to examine whether radial immunodiffusion or rocket immunoelectrophoresis give similar result. Five sera from pregnant women at the 34-39th week of gestation with beta : alpha ratios of 0.8-4.7 were assayed by both the latter methods against either the IARC 78 610 reference preparation of the SP1 Behring standard. When preparations were assayed by rocket immunoelectrophoresis (two laboratories), the dose-response curves were parallel. When preparations were assayed by radial immunodiffusion (two laboratories), parallelism was observed (one laboratory) after the addition of polyethylene glycol, the presence of which is necessary to visualize immune precipitates in which alpha is involved. Discrepancies observed when methodologies such as competitive radioimmunoassay are used, in which there are limited amounts of antibodies, are explained, at least partially, but the fact that the beta component has a greater relative affinity for the antibody as higher concentrations of beta : alpha mixtures are assayed. However, when antibody is present in excess, as in radial immunodiffusion and rocket immunoelectrophoresis, no such difference in affinity seems to occur.

Australia↗
PubMed1981

Free calcium ion concentration in pregnancy. A longitudinal study on 22 normal pregnant women.

302 samples from 22 normal pregnancies were frozen and kept for the analysis of free calcium ion concentration [Ca2+](7.4) at 37 degrees C and pH 7.40, after equilibration with CO2. Individual regressions were performed, and the concentration was found to increase slightly but significantly (5%, p less than 0.005) with the progress of the pregnancy. This increase excludes hypocalcemia as the cause of parathyroid overactivity during pregnancy, and a higher set point of the parathyrin (PTH) secretion is suggested.

Calcium↗
PubMed1979

Pregnancy-specific beta 1-glycoprotein (SP1) determined by means of electroimmunoassay, radial immunodiffusion and nephelometry.

A comparison has been made between rocket-immunoelectrophoresis (RIE), radial immunodiffusion (RID) and automated immunonephelometry (AIP) in the assay of pregnancy-specific beta 1-glycoprotein (SP1) in serum from pregnant women. Using RIE an interaction was demonstrated between the various SP1-reactive molecular populations causing a bias of up to 10%. An interaction corresponding to this phenomenon cannot be demonstrated when using RID and AIP. When correlating the serum-SP1 concentration of samples containing various ratios of SP1-reactive molecules by means of RIE, RID and AIP, it was demonstrated that there was no correlation between the results achieved using one method compared to the results achieved by either of the other methods. The results achieved using one method can therefore exclusively be judged from reference values determined using the same method. The analysis time is essentially shorter with AIP than with RIE and RID.

Female↗
PubMed1979

Differences in the slopes of dose-response curves measuring pregnancy specific beta 1-glycoprotein (SP1) by means of radioimmunoassay.

Variants of pregnancy specific beta 1-glycoprotein have been described previously. These variants seem to cause artificially low levels when measured by radioimmunoassay. We demonstrate that sera with indistinct precipitates in electroimmunoassay give less steep dose-response curves in radioimmunoassay than do sera with well defined precipitates. Until parallel dose-response curves are demonstrated for all variants, previously published data must be treated with reserve.

Chemical Precipitation↗
PubMed1979

Characterization of two pregnancy associated serum proteins with pregnancy specific beta 1-glycoprotein (PS-beta-G)-determinants.

The existence of two pregnancy associated, partially identical glycoproteins with PS-beta-G determinants were demonstrated in serum from pregnant women. Crossed and crossed-line immunoelectrophoretic analysis of pregnancy sera revealed two precipitates with alpha- and beta-mobility, respectively. The ratio between the precipitation areas in various samples could be related to three different types of precipitation patterns observed in rocket immunoelectrophoresis. This variation in precipitation pattern could so far not be related to the progression of any obstetric parameters. The diphasic shape of the precipitate in crossed immunoelectrophoresis was not changed by incubation with normal human male serum or antibody to normal human serum. Incorporation of 4% PEG in the gels enhanced the precipitate in the alpha-region. The cross-reactive glycoproteins were detected in all pregnant women examined. These results point to the need for specific antibody preparations permitting separate quantitation of the two antigen populations with PS-beta-G determinants.

Chemical Precipitation↗
PubMed1976

Reference interval for maternal serum alpha-fetoprotein.

Maternal serum alpha-fetoprotein (AFP) concentration was measured in 237 samples taken throughout the pregnancies of 28 normal pregnant women who all gave birth to normal infants. The patterns from these 28 individuals curves were compared graphically with an earlier published non-parametric 90% reference interval based upon single serum samples from other normal, pregnant women. The two "reference areas" were found to be quite similar. Maternal serum AFP values before and after induced abortion in a case of acrania and spina bifida demonstrated the value of serial maternal serum AFP quantitations in cases of suspected neural tube defects (NTD).

Female↗