A method for amplification and detection of a target nucleic acid in a sample comprising the steps of: (a) contacting said sample containing said target nucleic acid in a single reaction vessel with (i) one pair of oligonucleotide primers, each oligonucleotide primer capable of hybridizing to opposite strands of a subsequence of said target nucleic acid; (ii) a tagged probe comprising an oligonucleotide sequence that comprises an annealing portion and a tag portion, wherein the tag portion comprises a nucleotide sequence non-complementary to the target nucleic acid sequence, wherein the annealing portion comprises a nucleotide sequence at least partially complementary to the target nucleic acid sequence and hybridizes to a region of said subsequence of said target nucleic acid that is bounded by said pair of oligonucleotide primers and wherein the tag portion is attached to the 5' terminus or the 3' terminus of the annealing portion or wherein the tag portion is attached anywhere between the 5' terminus and the 3' terminus of the annealing portion via a linker; (b) amplifying said target nucleic acid by PCR using a nucleic acid polymerase having 5' to 3' nuclease activity such that during an extension step of each PCR cycle, the nuclease activity of the polymerase allows cleavage and separation of the tag portion from the annealing portion of the tagged probe; (c) hybridizing the cleaved tag portion from the tagged probe with a moligo template, said moligo template comprising an oligonucleotide sequence that comprises an annealing portion and an extension portion, said annealing portion comprising a nucleotide sequence complementary to the tag portion of the tagged probe and said extension portion comprising a nucleotide sequence that is non-complementary to the target nucleic acid sequence or to the tag portion of the tagged probe, such that the cleaved tag portion hybridizes to said annealing portion of the moligo template to form a partial duplex molecule, wherein said moligo template is attached on a solid phase chip; (d) reacting the partial duplex molecule with a nucleic acid polymerase to extend the cleaved tag portion into the extension portion of the moligo template; (e) measuring the extension in step (d) by molography wherein an increase in a molographic signal between step (c) and step (d) represents detection of the presence of the target nucleic acid; wherein all steps (a)-(e) are performed in the absence of a label. (a) contacting said sample containing said target nucleic acid in a single reaction vessel with (i) one pair of oligonucleotide primers, each oligonucleotide primer capable of hybridizing to opposite strands of a subsequence of said target nucleic acid; (ii) a tagged probe comprising an oligonucleotide sequence that comprises an annealing portion and a tag portion, wherein the tag portion comprises a nucleotide sequence non-complementary to the target nucleic acid sequence, wherein the annealing portion comprises a nucleotide sequence at least partially complementary to the target nucleic acid sequence and hybridizes to a region of said subsequence of said target nucleic acid that is bounded by said pair of oligonucleotide primers and wherein the tag portion is attached to the 5' terminus or the 3' terminus of the annealing portion or wherein the tag portion is attached anywhere between the 5' terminus and the 3' terminus of the annealing portion via a linker; (i) one pair of oligonucleotide primers, each oligonucleotide primer capable of hybridizing to opposite strands of a subsequence of said target nucleic acid; (ii) a tagged probe comprising an oligonucleotide sequence that comprises an annealing portion and a tag portion, wherein the tag portion comprises a nucleotide sequence non-complementary to the target nucleic acid sequence, wherein the annealing portion comprises a nucleotide sequence at least partially complementary to the target nucleic acid sequence and hybridizes to a region of said subsequence of said target nucleic acid that is bounded by said pair of oligonucleotide primers and wherein the tag portion is attached to the 5' terminus or the 3' terminus of the annealing portion or wherein the tag portion is attached anywhere between the 5' terminus and the 3' terminus of the annealing portion via a linker; (b) amplifying said target nucleic acid by PCR using a nucleic acid polymerase having 5' to 3' nuclease activity such that during an extension step of each PCR cycle, the nuclease activity of the polymerase allows cleavage and separation of the tag portion from the annealing portion of the tagged probe; (c) hybridizing the cleaved tag portion from the tagged probe with a moligo template, said moligo template comprising an oligonucleotide sequence that comprises an annealing portion and an extension portion, said annealing portion comprising a nucleotide sequence complementary to the tag portion of the tagged probe and said extension portion comprising a nucleotide sequence that is non-complementary to the target nucleic acid sequence or to the tag portion of the tagged probe, such that the cleaved tag portion hybridizes to said annealing portion of the moligo template to form a partial duplex molecule, wherein said moligo template is attached on a solid phase chip; (d) reacting the partial duplex molecule with a nucleic acid polymerase to extend the cleaved tag portion into the extension portion of the moligo template; (e) measuring the extension in step (d) by molography wherein an increase in a molographic signal between step (c) and step (d) represents detection of the presence of the target nucleic acid;