below detection threshold

USAGE SUMMARY

The phrase "below detection threshold" is correct and usable in written English.
It can be used in contexts related to measurements, scientific research, or data analysis where values are too low to be detected or measured accurately. Example: "The concentration of the substance in the sample was found to be below detection threshold, indicating that it is present in negligible amounts."

✓ Grammatically correct

Science

Human-verified examples from authoritative sources

Exact Expressions

18 human-written examples

First, genes that are detectable (positives: above detection threshold) and not detectable (negatives: below detection threshold) were determined for each tissue according to detection thresholds defined by each manufacturer (see Methods for detailed descriptions).

BMC Genomics

More than 90percentt of control subjects showed PCB 28 and PCB 101 levels below detection threshold, whereas most of the exposed subjects showed detectable blood levels of these congeners (p < 0.001, Fisher's exact test; see Table 1).

Environmental Health: A Global Access Science Source

Increased retention of [11C]HTP in NETs could improve the sensitivity of examination in addition to potentially visualizing smaller NETs currently below detection threshold.

EJNMMI Research

The advantages of the EDs consisted of a direct reading of the measured dose and lack of reading delay typical of TLDs, along with the latter's risk of loss, damage, and negative results displayed when below detection threshold (i.e., 100 μSv with ring TLDs).

EJNMMI Physics

In cytoplasmic fractions, Nrf2 protein level was below detection threshold in either cell type (data not shown).

Plosone

Indeed, if there were a few contralateral axonal projections, the FG labeling could well be below detection threshold of our method.

Plosone

Human-verified similar examples from authoritative sources

Similar Expressions

42 human-written examples

However, it is very likely that when no second domain is identified in silico, it is simply because the domain in question is either unknown or below detection thresholds.

Nature

With treatment, quantities of BV-associated bacteria declined below detection thresholds (except G. vaginalis).

Plosone

With metronidazole treatment, levels of BV-associated bacteria declined below detection thresholds and the participant was clinically BV negative at 1 month.

Plosone

Participant E had high levels of BV-associated bacteria at diagnosis which declined below detection thresholds (except G. vaginalis), while concentrations of L. jensenii increased 3.5-logs.

Plosone

With the exception of G. vaginalis, quantities of BV-associated bacteria decreased several logs and dropped below detection thresholds between Days 1 and 5 (Median = 3.5 days) of metronidazole treatment (Figure 3) in women with BV.

Plosone

Expert writing Tips

Best practice

When reporting results, always specify the method and its detection threshold to provide context for "below detection threshold" findings. For instance, "The concentration of lead in the water sample was below the detection threshold of 0.05 ppm using ICP-MS."

Common error

Avoid interpreting "below detection threshold" as complete absence of the substance. It simply means it's undetectable by the method used, not necessarily nonexistent. There may be trace amounts that existing equipment could not detect.

Linguistic Context

The phrase "below detection threshold" functions as an adjectival phrase modifying a noun (e.g., level, concentration, amount). It indicates that the quantity of something is less than the minimum level that a particular measurement method can reliably detect. This is supported by Ludwig AI's analysis of the phrase's usage.

Expression frequency: Common

Frequent in

Science

98%

News & Media

1%

Formal & Business

1%

Less common in

Academia

0%

Encyclopedias

0%

Wiki

0%

Ludwig's WRAP-UP

The phrase "below detection threshold" is a common and grammatically correct term, primarily used in scientific and technical fields to indicate that a quantity is too small to be reliably measured by a specific method. Ludwig AI confirms its proper usage. While it implies a low quantity, it doesn't mean the substance is necessarily absent. When using this phrase, specify the detection method and its threshold. Alternatives include "under the limit of detection" or "undetectable level". Be cautious not to misinterpret it as a sign of complete absence. The predominant use of this phrase is within scientific contexts.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

under the limit of detection

This phrase uses "under" instead of "below" to convey a similar meaning of not being measurable.

non-detectable

A shorter, more direct way of saying that something wasn't detected.

undetectable level

This alternative focuses on the state of being undetectable rather than comparing it to a threshold.

below the limit of quantification

This indicates that the quantity is not only undetectable but also cannot be reliably measured.

trace amounts

This implies that the substance is present, but only in very small, immeasurable quantities.

insignificant quantity

This highlights the negligibility of the amount present.

not quantifiable

This term means something cannot be expressed or measured as a number or quantity.

within noise levels

This phrase indicates that any signal from the substance is indistinguishable from background noise.

at an immeasurable concentration

This indicates the difficulty in determining the concentration of the substance.

beneath the sensitivity of the assay

This specifies that the detection method used isn't sensitive enough to detect the substance.

FAQs

What does it mean when a substance is "below detection threshold"?

It means the quantity of the substance is so low that it cannot be accurately measured or detected by the instrument or method used. It doesn't necessarily mean the substance is absent, just that it's present in an amount too small to detect.

What are some alternatives to saying "below detection threshold"?

You can use alternatives like "under the limit of detection", "undetectable level", or "trace amounts" depending on the context.

Is it correct to assume a substance is absent if it's "below detection threshold"?

No, it's not accurate to assume complete absence. "Below detection threshold" only indicates that the substance wasn't detected by the specific method used. More sensitive methods might detect it, indicating that a concentration is present but is simply too small for existing equipment to pick up.

How do I report a result that is "below detection threshold" in a scientific paper?

You should state the specific method used and its detection threshold. For example, "The concentration of the compound was below the detection threshold of 0.1 mg/L as determined by HPLC." You may also consider reporting the value as less than the detection limit (e.g., <0.1 mg/L).